Genpei War

The Genpei War was a series of conflicts between the Minamoto, Taira, and Fujiwara clans and their branches to take over the land of Japan, despite the name which signifies that the conflicts were a singular event. In the end, the Kiso Minamoto took over the land, after decimating Yoshinaka Minamoto, the Taira, and Fujiwara, in 1185.

Background
Long had the Heian Dynasty ruled in peace over all of Japan, with their warlords submitting to the emperor, Emperor Nijo. However, the dynasty's power declined, and the sophisticated, cunning, and ruthless Taira clan dominated the imperial government. After years, they were prepared to make their move, with the Minamoto clan resisting them. Meanwhile, the Fujiwara watched this conflict, as the Genpei War had begun.

The Taira Expansion
The Taira clan began by expanding into Kawachi Province, territory of the Ishikawa clan. Munemori Taira and 675 Taira besieged and captured the castle town of Fujidera, slaying Nobuari Ishikawa and his 570 Ishikawa troops defending the city. After this, the Taira prepared for an invasion of Shikoku, invading the Kagawa clan of Ieyoto Kagawa. In Awa Province, at the Battle of Tokushima in 1177, Ietoyo Kagawa and his army were devastated by the Fukuhara, led by Shigehira Taira, who had just come of age to become a general. The Kagawa clan was crushed by this defeat, losing Tokushima and Awa. But soon, Morotada Kagawa and 900 troops recaptured the region, defeating Shigehira and Munemori.